In regard to the equation Sales = 53.44 + 0.63X1 - 0.79X2, which of the following statements is true? a. For a 0.79 increase in X2, sales will decrease by 1 b. In case X1 and X2 are both zero, sales will increase by 53.44 c. For every one point increase in X2, Sales will decrease by 0.79 d. For a 0.63 increase in X1, sales will decrease by 1

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